[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

# StartOfTheDay

Calculate the start of the day as a DateTime value, given a moment in the day.

## Declaration

Source position: dateutil.inc line 165

 function StartOfTheDay( const AValue: TDateTime ):TDateTime;

## Arguments

 AValue DateTime from which to calculate start of the day.

## Function result

Start of the day (00:00) as DateTime value

## Description

StartOfTheDay extracts the date part of AValue and returns a TDateTime value with the date/time indication of the start (0:0:0.000) of this day.

 StartOfADay Return the start of a day as a DateTime value, given a day indication StartOfTheWeek Return the first day of the week, given a date. StartOfAWeek Return a day of the week, given a year, week and day in the week. StartOfAMonth Return first date of month, given a year/month pair. StartOfTheMonth Calculate the first day of the month, given a date in that month. EndOfTheWeek Calculate a DateTime value which represents the end of a week, given a date in that week. EndOfAWeek Return the last moment of day of the week, given a year and a week in the year. EndOfTheYear Calculate a DateTime value representing the last day of a year, given a date in that year. EndOfAYear Calculate a DateTime value representing the last day of a year EndOfTheMonth Calculate a DateTime value representing the last day of the month, given a day in that month. EndOfAMonth Calculate a datetime value representing the last day of the indicated month EndOftheDay Calculate a datetime value that represents the end of a given day. EndOfADay Calculates a DateTime value representing the end of a specified day

## Example

```Program Example36;

{ This program demonstrates the StartOfTheDay function }

Uses SysUtils,DateUtils;

Const
Fmt = '"Start of the day : "dd mmmm yyyy hh:nn:ss';

Begin
Writeln(FormatDateTime(Fmt,StartOfTheDay(Today)));
End.
```